you need a phone with a car base mount unit. that mobile base mount should offer a +12 volt interrupt trigger. you use that and wire it to the cellular mute on the Eclipse. this will mute the stereo if the phone rings while it's plugged into the base unit. use a hands free system with it as well ideally to avoid a car wreck when you're on the phone. top of the driver side A piller and the sun visor are idea places for the mic/speaker setup.